Which of the following commands will reduce all consecutive spaces down to a single space?
A. tr ‘s’ ‘ ‘ < a.txt > b.txt
B. tr -c ‘ ‘ < a.txt > b.txt
C. tr -d ‘ ‘ < a.txt > b.txt
D. tr -r ‘ ‘ ‘n’ < a.txt > b.txt
E. tr -s ‘ ‘ < a.txt > b.txt
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